Dowel-casing for fixing in ceilings and walls.



W. SCHMIDT. DOWEL CASING FOR FIXING IN GEILINGS AND WALLS.

APPLIOATION FILED NOV. 16,1912.

Patented Feb. 10, 1914,

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UNITED STATEt i PATENT QFFICE.

WILLY SCHMIDT, OF FRANKFORT-ON-THE-MAIN, GERMANY.

DOWEL-CASING FOR FIXING IN CEILINGS AND \VALLS.

Application filed November 16, 1912.

To all whom it may concern Be it known that I, TILLY SCHMIDT, citizen ofthe German Empire, residing at Frankfort-on-the-Ma-in, in the Provinceof Hesse-Nassau and Kingdom of Prussia, Germany, have invented certainnew and useful Improvements in Dowel-Casings for Fixing in Ceilings andWalls; and I do hereby declare the following to be afull, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

Fixing dowels, the screw bolts of which can be introduced from below andwhich serve for fixing ceiling brackets, shafting and the like are inthemselves known. However, in these, abnormal bolts with long heads mustbe employed which are dear owing to the unusual steps in theirmanufacture. In these, the head lies in corresponding slots when thebolt is turned sidewise through 90 degrees so that the disadvantage ispresent that upon attempting to screw up the fastening nut, the bolt israised and then falls down. However, the bolts which are pushed insidewise are still more dangerous for upon bearings becoming loose whichin the case of large, unbalanced pulls in the belts is not unlikely, thebearing bracket together with the machine parts mounted thereon can falldown and this is a source of great danger to anyone happening to benear. This trouble is completely removed by the invention hereinafterdescribed.

The subject matter of the invention is described in the documents andFigure 1 shows the same in horizontal section. Fig. 2 in verticalsection through the place 03-7 and Fig. 3 in plan with the coverremoved.

The dowel casing (4 possesses in order to secure certain advantages atapering outside shape. In the inside is arranged the ascending passageZ) sloping sidewise with the maze like continuation passage 0, thedimensions of which are designed so that the square head (Z of ascrew-bolt of usual form can be inserted. In connection with thepassages b and c is a third narrower passage which is of such a breadththat the stem of the bolt comfortably passes through but the head (Zdoes not.

If it is attempted according to Fig. 1 to Specification of LettersPatent.

Patented Feb. 10, 1914.

Serial No. 731,665.

insert the headed bolt with its head into the dowel casing, it is workedupin the direction of the sloping ascending passage 7) to the point 7.If it is desired to bring the bolt to its usual vertical position, thestem of the bolt is pressed against the corner of the casing and effectsa turning about this point so that the head (Z of the bolt slides intothe passage 0 while the stem takes up its position in the narrowerpassage 6. The head of the bolt then rests on the sur faces in and 2'(Figs. 1 and 2) which are formed by the join of the passages b, c withe.

The supporting bolt is retained in its vertical position under its ownweight alone; this is much more advantageous if a hanger bearing or thelike is secured by it.

When under load, neither vertical nor horizontal forces can bring thesupporting bolts out of the casing.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent of the United States is:

1. A dowel casing comprising a hollow triangular frame open at its lowerapex and providing an aperture for the insertion of a bolt, togetherwith spaced apart abut ments on the walls of said frame providing a Vshaped channel whereby said bolt may be inserted endwise and then movedsidewise to its resting place on said abutments.

2. A dowel casing comprising a hollow triangular frame open at its lowerend, spaced apart abutments providing on the walls of said frame a Vshaped channel whereby a bolt may be inserted endwise and then movedsidewise to its resting place on said abutments.

3. A dowel casing comprising a hollow triangular frame open at one endthereof spaced apart, triangular abutments on the inside of said frameadapted o form together with the walls thereof, a ii-shaped channelwhereby a bolt may be inserted endwise and then moved sidewise to itsresting place on said abutments.

In testimony whereof I affix my signature in the presence of twowitnesses.

VVILLY SCHMIDT.

Witnesses:

FRIEDRICH CARL WENZEL, MAX HERMANN HoPPNnR.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

